Référence:
CHAPLEAU, Robert, ALLARD, Bruno, TRÉPANIER, Martin (1997). Transit Path Calculation Supported by a Special GIS-Transit Information System, Transportation Research Record, Washington, no. 1521, pages 98-111. |
Type:
Publication avec comité de lecture
Organisme:
World Conference on Transportation Research
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Résumé
The Société de transport de la Communauté urbaine de Montréal (STCUM, Montréal Urban Community Transit Corporation) has recently undertaken the task of computerizing its phone information centre. AUT-OBUS provides callers with optimal route choices within the STCUM transit network. An original system based on geographical and operations databases combined with interactive path calculation and data processing software has already been implemented.
A special GIS was developed to process the origins and destinations based on the client's specifications. Multiple forms of spatial referencing are provided: street addresses, trip generators and attractors, monuments, special activities, street intersections, transit references (subway and rail stations, bus routes, terminals, ...). The best path calculation is carried out using interactively-calibrated impedance functions (walking, in-vehicle, waiting, transfers, fares, mode restriction). An added challenge was the necessary consideration of the network geometry, commercial speed, day type, trip time and headway, and the validation of the computed paths using existing schedules. For a transit network the size of Montréal's, consisting of 16 000 bus stops, 230 bus routes, and a pedestrian network of 80 000 links and 28 000 nodes, the calculation of the optimal path for a given origin-destination pair is less than 2 seconds using a typical PC-Pentium microcomputer. |